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Here at Afuelscience.com we use this method...the number of valence electrons is the number of s and p electrons in the outermost shell (highest n). The number of valence electrons can also be determined by counting across the period, skipping the transition metals, until the element is reached. It is also the group number. If there is more than one atom, the number of valence electrons is the sum of all the atoms in the molecule or polyatomic ion. For ions, add the value of a negative charge and subtract the value of a positive charge. >> Example 1 How many valence electrons are in the following? # N # H2S # CO32- # NH4+ Solution: # Nitrogen is in group 5A. It has five valence electrons. # Hydrogen has one valence electron, and sulfur has six. The total for the molecule is 2(1) + 6 = 8. # Carbon has four valence electrons; oxygen has six; then two for the charge. 4 + 3(6) + 2 = 24. # Nitrogen has five valence electrons; hydrogen has one, minus one for the charge. 5 + 4(1) - 1 = 8.
I think you mean "what elements have two electrons in the valence shell". The elements that are thought to have two valence electrons are the elements in the second column of the periodic table, (e.g. Mg - magnesium, Ca - calcium, etc.). He - helium is also known to have two valence electrons.
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How many protons and valence electons are in phosphorous?
6
Which element have two valence electrons?
Calcium (Ca) has two valence electrons.
How many valence electrons should an element to react with a element with 7 valence electrons?
one valence electron
What is an element that is shiny solid at room temperature has atoms with two valence electrons'?
Atone
What element has two fewer valence electrons than noble gases?
The element with two fewer valence electrons than noble gases is fluorine. Noble gases have a full valence shell with 8 electrons, while fluorine has 7 valence electrons.
How many valence electons does francium have?
Francium has one valence electron.
How many valence electons are in lead?
4
Does boron have three or five valence electons?
Boron has 3 valence electrons.
What type of electons are available for bonding?
valence electrons
How many protons and valence electons are in phosphorous?
6
How many valence electons does hydrogen have?
One(1)
What is an covalent bond?
a type of strong chemical in which two atoms share one or more pairs of valence electons
What are electons that are found at the atom's highest or outer level called?
Valence electrons. They exist in the atom's valence shell.
Element 3 lithium has one valence electron and element 4 beryllium has two valence electrons Element 5 boron has how many valence electrons?
Boron has 3 valence electrons.Boron has 3 valence electrons.
What name is given to an outer shell containing eight electrons?
Valence electons
Which element have two valence electrons?
Calcium (Ca) has two valence electrons.
A bond form when two atoms share one or more pairs of electrons?
That type of bond is called "covalent" since they share the electons in their valence shells.
